Lace tightening device



FIG. 1 is a perspective view of the lace tightening device;

FIG. 2 is a front view of the lace tightening device;

FIG. 3 is a back view of the lace tightening device;

FIG. 4 is a first side view of the lace tightening device;

FIG. 5 is a second side view of the lace tightening device;

FIG. 6 is a top view of the lace tightening device; and,

FIG. 7 is a bottom view of the lace tightening device.

The broken lines in the drawings represent portions of the lace tightening device that form no part of the claim. 

CLAIM I claim the ornamental design for a lace tightening device, substantially as shown and described. 